As luck would have it, I just bought one on eBay two weeks ago. Got sick of fiddling with my 854x unit and these were $309 brand new. Well, parts / labor adds up to that pretty quick as mine would work perfectly fine one day and not the next. Anyway, I digress.
Send me a Private Message and I'll send you a pdf. In the meantime, what's going on with it, I've probably fiddled with mine long enough to know how to help.